Mount for percussive drills



March 1s, 1930. G. M. NELL l 1,751281 MOUNT FOR PERCUSSIVE DRILLS Filed Dec. 24, 1927 l N VEN TOR.

A TTORNE Y.

Patented Mar. 18, 1930 UNITED srArs garr OFFICE l GUSTAVE M. NELL, F DETROIT, MICHIGAN, A.SSIGITOR TO CHICAGO PNEUMATIC TOOL COMPANY, OF NEW YORK, N. Y., A COEPORATON OF NEW JERSEY MOUNT FOR PERCUSSIVE DRILLS Application led December 24, 1927. Serial No. 242,356.

This invention relates to supporting means for percussive machines withparticular reference to shell mounts provided with feeding means for advancing the machine mounted thereon toward the work.

Among the objects of the invention are to overcome or greatly to reduce breakage, to provide cushioning means between'the percussive machine and the mount, and in general to improve prior supports for machines of the described type in the interests of more eiicient and satisfactory service.

In order to illustrate the invention concrete embodiments thereof are shown in the accompanying drawings, in which:

'Fig 1 is a top plan view of a shell mount with a rock drill supported thereon;

Fig. 2 is a similar plan view of a shell mount (without the drill) showing a modification; and

Fig. 3 is a sectional view substantially on stop -washers 7 and 8) and the respective adthe line 3-3 of Fig. 1 showing certain parts in' elevation.

' Each. of the'v shell mounts shown in Figs. 1 .25 and 2 comprises an elongate.channel-shaped casting or forging a having sides b provided with axial' recesses or grooves slidingly to receive the projecting flanges or wing portions not shown) of a drill ce' mounted thereon. Each shell mount has a feed screw c disposed in the channel portion thereof to cooperate with the feed nut m (Fig. 3) on the drill in moving the drill longitudinally of the mount. Screw 'c is supported in bearings provided by rigid supports d and e at opposite ends of the' drill mount and maybe rotated by handle f. Support Z may be rigidly maintained in spaced relation with the shell proper' t by spacing vsleeves 7L on the shell rodsY g.

In accordance with the present invention feed screw d is arranged for movement relativeito shell a and its'bearing supports d and l e by having reduced'porti'ons for axial sliding movement 'in thebearings provided `by its springs 3 and 4f, disposed upon the reducedportion'of'the feed "screw and on "opposite sides' of one 'of the rigid bearingH supports,

such as d. Spring 3 is interposed between handle f and support Z to permit movement of screw c to the left, while spring t is interposed between support cZ and a suitable stopon screw o, which may be a shoulder formed by the reduced portion of the screw or a washer 5 thereby permitting yielding movement of the screw to .the right. Suitable thrust receiving means, such as the ball thrust washers 6, maybe interposed between support Z and springs 3 and l respectively.`

Fig-2 shows a slightly Vdifferent arrangement for permitting limited yielding movement of the feed screw relative to the shell proper. As in Fig. 1, bearing supports d and c for feed screw o are rigidly positioned upon the shell mounting and the feed screw has reduced ends permitting sliding movement of the latter in the bearings of supports Z and e.

L Interposed between stopsV (such as the shoulders fornied'by vthe reduced ends thereof or j acentbearing supports are resilient means in the form of coil springs 9 and 10. Spring 9 permits movement of the feed screw to the ball or any other suitable type may be interposed between springs 9 and 10 and the respective adjacent bearing supports d and e.

\ While preferred forms of the invention have been herein shown anddescribed, it is to be understood that the invention is not limited to the specific details thereof, but covers al1 changes, modifications and adaptations Within-the scope of the appended claims.

VI claim as my invention r- 1. The combinationl with a percussive drill of a shell mounting providing slide ways for Y said drill, mechanism including a feed screw for moving said drill on said mounting, said mounting providing iiXed bearingsfor said screw, and means permitting limited yieldingmovement of said screw relative'to said bearings for absorbing the shocksV and vibration'incident to the operation of the drill.

'2. The combination with a percussive drill of a shell mounting providing slide ways for said drill, mechanism including a feedscrew for moving said drill on said, mounting, 'said mounting providingfixed bearings for said screw, and resilient means on said screw arranged to permit yielding movement of the latter for absorbing the shocks and vibration incident to the operation of the drill.

v3. The combination with apercussive drill of a shell mounting providingA slide ways for said drill, mechanism including a feed screw for moving said drill on said mounting, transversely disposed means on said mounting providing fixed bearings for saidI screw, and means providing for limited yielding movement of said screw axially of said bearings.

4. The combination with a percussive drill of a shell mounting providing slide ways for said drill, mechanism including a feed screw for moving said drill on said mounting, transversely disposed means on said mounting providing fixed bearings for said screw, and resilient means carried by said screw providing for limited yielding move-ment of said screw axially forsaid bearings. y 5.- The combination with a percussive drill of asli-ell mounting providing slide ways for said drill, mechanism including a feed screw for 'moving said drill on said mounting, transverse supports' on said mounting providing fixed bearings for said screw, a stop on said screw, and resilient means on said screw interposed between said stop and one of said supports for' permittedlimited axial 'movement of said screw.

6. The combination with a percussive drill of a shell mounting providing slide ways for said drill, mechanism includinga fee-d screwz formovingV said drill on said mounting,

Vtransverse supports on'said mounting providing fixed bearings for said screw, a stop on said screw, resilient means on said screw interposed between said stop and one of said supports for permitting limited axial move- Vment of said screw, and a thrust bearing b etween lsaid means and said support.

7. The combination with a nercus'sive drill of a shell mounting-providing slide ways for said drill, mechanism including a feed screw for moving said drill on said mounting, transverse supports onsaid mounting' providing fixed bearings for said screw, said screw having reduced portions permitting axial movement of said screw in said bearings, and resilient means arranged yieldingly to resist movement of said screw iin both directions. A j

8, Avshell mountingfoi" rock drills coinprising a member having guide ways to receive wing project-ions on a drill, a feed. screw for moving the drill. upon said member, transverse supports providing fixed, aligned-bearings for said screw, means rigidly securing said-'supports to said member,v saidserew having vreduced.portions permitting` axial movement of saidscrew lin ,said bearings, land resilient 'means arranged. yeldingiy .te resist niovement of said screw in at least one direct on.

9. A shell mounting for rock drills comprising a member having guide ways to receive wing projections on a drill, a feed screw for moving the drill upon said member, transverse supports providingfixed, aligned bearings for said screw, means rigidly securing e ings for said screw, means rigidly securing said supports to said member, said screw havi ing reduced portions permitting axial movement of said screw in saidbe-arings, and resilient means on a reduced portion of said screw and engaging one of said supports.

yieldingly to resist movement of saidscrew in at least one direction.

1l. Av shell mounting for rock drillscomprising a member having guide ways to receive wing projections on a drill, a feed screw v for moving the` drill upon said member, transverse supports providing fixed bearings for said screw, meansrigidly securing said supports to said. member, said screw having reduced portions permitting axial movement off said screw in said bearings, and resilient means on a reduce-d portion of said. screw von opposite sides of one of said supports yieldin'gly to resist movement of said screw inH` both directions.` I Y 12. A sli-ell mounting for rock drills comprising a member having guide ways to receive wing projections on a'drill, a feed screwk forv moving the drill upon said member, transverse supports providing fixedbearings for'- said screw, means rigidly securing said supports to ysaid member, said screw having reduced portions permitting axial movement iio of 'said screw in lsaid bearings, and resilient meansin the-form of a coil spring encircling a reduced portion of said screw adjacent one yof said supports for resisting movement of said lscrew in one direction.

13. A shell mounting for rockv drillscom-e prising a member havin-g guide waysy to receive wing projections on a drill,- a-feed screw for moving tlie drill upon said member, transverse supports providing fixed.- bearings for said. screw, `means rigidly securingsaid sup- M ports to said rnen-iber, said Ascrew havingyre-J duced portions permitting axial movement of saidA screw said bearings, and resilient means in the Yform of a coil spring-encircling a reduced portion of said screw adjacent cnefof said suppertsfor movement-ct 'saldi lg@ screw in one direction, and a thrust bearing between said support and said spring.

14. A shell mounting for rock drills comprising a member having guide ways to receive wing projections on a drill, a feed screw for moving the drill upon said member, transverse supports providing fixed bearings for said screw, means rigidly securing said supports to said member, said screw having 1reduced portions permitting axial movement of said screw in said bearings, andvresilient means in the form of coil springs encircling a reduced portion of said screw on opposite sides of one of said supports for resisting movement of said screw in both directions.

15. A shell mounting for rock drills comprising a member having guide ways to receive Wing projections on a drill, a feed screw for moving the drill upon said member, transverse supports providing fixed bearings for said screw, means rigidly securing said supports to said member, said screw having reduced portions permitting axial movement of said screw in said bearings, and resilient means in the form of coil springs encircling a reduced portion of said screw on opposite sides of one of said supports for resisting movement of said screw in both directions, and thrust bearings on opposite sides of said last-named support directly engaged by said springs.

Signed by me at Detroit, in the county of Wayne, and State of Michigan, this 15th day of December, 1927.

GUSTAVE M. NELL. 

